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Plag, H.-P.; Beutler, Gerhard; Gross, R.; Herring, T.A.; Rizos, C.; Rummel, R.; Sahagian, D.; Zumberge, J. (2009). Introduction. In: Plag, Hans-Peter; Pearlman, Michael (eds.) Global Geodetic Observing System. Meeting the Requirements of a Global Society on a Changing Planet in 2020 (pp. 1-15). Heidelberg: Springer Verlag
Plag, H.-P.; Beutler, Gerhard; Gross, R.; Herring, T.A.; Poli, P.; Rizos, C.; Rothacher, M.; Rummel, R.; Sahagian, D.; Zumberge, J. (2009). Recommendations. In: Plag, Hans-Peter; Pearlman, Michael (eds.) Global Geodetic Observing System. Meeting the Requirements of a Global Society on a Changing Planet in 2020 (pp. 283-292). Heidelberg: Springer Verlag
